Enhancing the pollutant removal performance and biological mechanisms by adding ferrous ions into aquaculture wastewater in constructed wetland. (December 2019)

• Record Type: Journal Article
• Authors: Zhimiao, Zhao; Xiao, Zhang; Zhufang, Wang; Xinshan, Song; Mengqi, Cheng; Mengyu, Cheng; Yinjiang, Zhang
• Is Part Of: Bioresource technology. Volume 293(2019)
• Publication Date: 2019-12
• Subjects: CWs -- Aquaculture wastewater -- Ferrous ion -- Microbial condition; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2019.122003
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Functional amino acids in plants could be adjusted by iron ions. MDA in plants was weakened by adding 20 mg/L ferrous ions in CWs. The functional microbial community was optimized by ferrous ions. Adding ferrous ions promoted the salt resistance of CWs. Abstract: Aquaculture wastewater seriously threatens the human health. In this study, non-poisonous iron was added into constructed wetlands to purify aquaculture wastewater and the wastewater treatment performances of CWs were explored under the treatment conditions of different plant species and different dosages of ferrous ions. The optimal treatment conditions were experimentally determined as follows: 20 mg/L ferrous ions in CWs planted with Canna indica after 7-day operation, the removal efficiencies of TN, TP and COD were respectively 95 ± 1.9%, 77 ± 1.2% and 62 ± 2%. The improvements in the pollutant removal performance depended on biological mechanisms of plants and microorganisms. The optimal dosage of iron ions could adjust enzyme activities and functional amino acids. Specific functional bacteria ( Paracoccus detected based on nirK genetic information and Hydrogenophaga detected based on pufM genetic information) were cultured and domesticated by iron ions. The functional bacteria promoted nitrogen and phosphorus removals.